Washington Hazardous Waste Treatment regulations & environmental compliance analysis

Washington Hazardous Waste Treatment: What you need to know

Governing Law and Regulations

Dangerous waste (DW) container rules: Washington Administrative Code (WAC) 173-303-630 and WAC 173-303-400 (interim status)

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Dangerous waste treatment tank rules: WAC 173-303-640 and WAC 173-303-400 (interim status)

Dangerous waste land treatment rules: WAC 173-303-655 and WAC 173-303-400 (interim status)

Dangerous waste surface impoundment rules: WAC 173-303-650 and WAC 173-303-400 (interim status)

Dangerous waste incineration rules: WAC 173-303-670 and WAC 173-303-400 (interim status)

Chemical, biological, and physical treatment rules: WAC 173-303-400(3)(a)

Thermal treatment rules: WAC 173-303-400(3)(a)

Neutralization of DW: WAC 173-303-040, WAC 173-303-400(2)(c)(iv), WAC 173-303-600(3)(j), and WAC 173-303-802(5)

Permit-by-Rule: WAC 173-303-802

On-site treatment rules for generators:

Large quantity generators (LQGs) and medium quantity generators (MQGs): WAC 173-303-170(2)(b)(iv)

Small quantity generators: WAC 173-303-171(1)(e)

Special waste: WAC 173-303-170(2)(b)(v)

Regulatory Agency

Washington Department of Ecology (WDOE) Hazardous Waste and Toxics Reduction Program

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Washington has adopted the U.S. Environmental Protection Agency's (EPA) Hazardous Waste Generator Improvements Rule, effective in the state as of April 30, 2019, which includes standards that allow generators to treat hazardous waste on-site. The state's dangerous waste (DW) treatment rules include the federal requirements and the state's more stringent rules, which apply to facility permit application process, treatment facility design, construction and operation, and on-site treatment by large quantity generators (LQGs), medium ...


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